(8)
Position FLT CONTROL B switch to ON. Engage the Yaw Damper engage switch. Observe that the Yaw Damper indicator light extinguishes within 3 seconds.
NOTE: During the following steps, the Yaw Damper indicator on the P2 center instrument panel will move. Ensure that it moves left, then right and then returns to the center position. This movement should occur twice during the test.
(9)
Press YES on the YDC BITE panel. Observe that TEST IN PROGRESS is temporarily displayed followed by TESTING LIMITS.
(10)
Observe that, after approximately 2 seconds, the following data is displayed. X's are numeric and their actual values are irrelevant.
(a)
YD cmd positive
(b)
LVDT pos XXXXX deg
(c)
YD cmd negative
(d)
LVDT pos XXXXX deg
(e)
YD cmd zero
(f)
LVDT pos XXXXX deg
(g)
PCU LIM +/-X deg
(11)
Observe, after approximately 5 seconds, that the panel displays the following data:
(a)
SECOND SWEEP
(b)
YD cmd XXXXX deg
(c)
LVDT pos XXXXX deg
(d)
YD cmd XXXXX deg
(e)
LVDT pos XXXXX deg
(f)
YD cmd XXXXX deg
(g)
LVDT pos XXXXX deg
(12)
Ensure that the panel displays TEST PASS after approximately 60 seconds.
(13)
Press ON/OFF. Observe that TURN OFF DISPLAY? is displayed on the panel.
(14)
Press YES. Observe that DISPLAY OFF is temporarily displayed followed by the panel blanking. Observe the AUTOPILOT DISENGAGE WARNING lights are not illuminated.
(15)
Position the YAW DAMPER engage switch to OFF. Observe that the YAW DAMPER warning light, the FLT CONT annunciator light, and both MASTER CAUTION lights illuminate.
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May 01/00 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 22-12-01 Page 503
D. Pressure Reducer Test
(1)
Position FLT CONTROL A switch to OFF. Observe that the FLT CONTROL A LOW PRESSURE light illuminates.
(2)
Press ON/OFF on the YDC BITE Panel. Within 10 seconds, press YES. Observe that PLEASE WAIT is temporarily displayed followed by EXISTING FAULTS? on the YDC BITE panel. Observe the AUTOPILOT DISENGAGE WARNING lights illuminate steadily.
(3)
Press down arrow until GROUND TESTS? is displayed on the panel.
(4)
Press YES. Observe that SELF TEST? is displayed on the panel.
(5)
Press down arrow until REDUCER TEST? is displayed on the panel.
(6)
Press YES. Observe that WARNING! WARNING!, then RUDDER MOVEMENT, then RUDDER CLEARED? is displayed on the panel.
WARNING: ENSURE PERSONNEL ARE CLEAR OF RUDDER PRIOR TO PERFORMING THESE STEPS. DEATH OR INJURY TO PERSONNEL MAY RESULT.
(7)
Press YES on the YDC BITE panel. Observe that SYS A HYD ON? is displayed.
(8)
Position FLT CONTROL A Switch to ON. Observe that the FLT CONTROL A LOW
PRESSURE light extinguishes within 6 seconds.
(9)
Press YES on the YDC BITE panel. Observe that the following data is displayed. The X's are numeric values and their actual values are irrelevant.
(a)
Reducer = off
(b)
A hyd XXXX psi
(c)
Make sure that the value displayed in step (b) is greater than 2200 psi.
(d)
Reducer = on.
(e)
A hyd XXXX psi.
(f)
AIRPLANES PRE SB 737-27-1252: Make sure that the value displayed in step (e) is between 1250 and 1650 psi. AIRPLANES POST SB 737-27-1252: Make sure that the value displayed in step (e) is more than 1600 and less than 2000 psi.
(g)
Reducer -off.
(h)
Make sure that the value displayed in stp (g) is greater than 2000 psi
(10)
Observe that Lo Press (A) Off? is displayed on the YDC BITE panel and the FLT
CONTROL A LOW PRESSURE light is OFF.
(11)
Press YES on the YDC BITE panel. Observe that LO PRESS (A) ON? is displayed.
(12)
Observe that the FLT CONTROL A LOW PRESSURE light is illuminated.
(13)
Press YES on the YDC BITE panel. Observe that the panel displays TEST PASS.
(14)
Press ON/OFF. Observe that TURN DISPLAY OFF? is displayed on the panel.
(15)
Press YES. Observe that the DISPLAY OFF is temporarily displayed followed by the panel blanking. Observe the AUTOPILOT DISENGAGE WARNING lights are not illuminated.
(16)
Position the FLT CONTROL A switch to OFF.
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